Revert of Adding status to swap complete

ui/ozone/platform/drm/gpu/gbm_surfaceless.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/gpu/gbm_surfaceless.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "ui/ozone/platform/drm/gpu/drm_device.h"
 #include "ui/ozone/platform/drm/gpu/drm_device_manager.h"
 #include "ui/ozone/platform/drm/gpu/drm_vsync_provider.h"
 #include "ui/ozone/platform/drm/gpu/drm_window.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 
 namespace ui {
-namespace {
-void EmptyPageFlipCallback(gfx::SwapResult result) {
-}
-}  // namespace
 
 GbmSurfaceless::GbmSurfaceless(DrmWindow* window_delegate,
                                DrmDeviceManager* drm_device_manager)
     : window_delegate_(window_delegate),
       drm_device_manager_(drm_device_manager) {
 }
 
 GbmSurfaceless::~GbmSurfaceless() {
 }
 
 intptr_t GbmSurfaceless::GetNativeWindow() {
   NOTREACHED();
   return 0;
 }
 
 bool GbmSurfaceless::ResizeNativeWindow(const gfx::Size& viewport_size) {
   return true;
 }
 
 bool GbmSurfaceless::OnSwapBuffers() {
   return window_delegate_->SchedulePageFlip(true /* is_sync */,
-                                            base::Bind(&EmptyPageFlipCallback));
+                                            base::Bind(&base::DoNothing));
 }
 
 bool GbmSurfaceless::OnSwapBuffersAsync(
     const SwapCompletionCallback& callback) {
   return window_delegate_->SchedulePageFlip(false /* is_sync */, callback);
 }
 
 scoped_ptr<gfx::VSyncProvider> GbmSurfaceless::CreateVSyncProvider() {
   return make_scoped_ptr(new DrmVSyncProvider(window_delegate_));
 }
 
 bool GbmSurfaceless::IsUniversalDisplayLinkDevice() {
   if (!drm_device_manager_)
     return false;
   scoped_refptr<DrmDevice> drm_primary =
       drm_device_manager_->GetDrmDevice(gfx::kNullAcceleratedWidget);
   DCHECK(drm_primary);
 
   HardwareDisplayController* controller = window_delegate_->GetController();
   if (!controller)
     return false;
   scoped_refptr<DrmDevice> drm = controller->GetAllocationDrmDevice();
   DCHECK(drm);
 
   return drm_primary != drm;
 }
 
 }  // namespace ui